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Abstract

We experimentally demonstrate a flexibly tunable multiwavelength erbium-doped fiber laser based on degenerate four-wave mixing in a dispersion-shifted fiber. We successfully achieve the stable operation of the multiwavelength erbium-doped fiber laser at room temperature. The number of channels and wavelength spacing of the proposed multiwavelength laser can be controlled by the combination of two polarization maintaining fiber segments in the intracavity Lyot-Sagnac filter. We achieve 1.0 nm-spacing eleven channel and 0.8 nm-spacing seventeen channel lasing wavelengths at room temperature. The lasing wavelength of multiwavelength fiber laser can be also controlled by the polarization controller.

Output spectra of the tunable multiwavelength EDF laser depending on the combination of PMF segments in the Lyot-Sagnac filter. The extinction ratio was as high as ~ 50 dB. (a) Δλ = 1.0 nm, number of channels = 11. (b) Δλ = 0.8 nm, number of channels = 17.

(a) Output spectra of the proposed tunable multiwavelength EDF laser when the polarization angle of the quarter-wave plate was 0° (solid line) and 90° (solid line), respectively, and (b) the continuous tuning of lasing wavelengths with the variation of polarization angle of the quarter-wave plate.